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Flexible OLED의 표면 처리에 의한 발광 효율 향상
송민철,박진호,여석기,윤덕선,윤인수,설지윤 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
PET로 된 Flexible 유기물 ITO에 O2 Plasma로 Passivation 처리한 후 발광 효율 향상 유무를 살펴 보고, 여러 가지 저분자 및 고분자 유기물질들을 정공 주입층으로 삽입한 후 발광 효율의 변화를 연구하였다.
송민철,Song, Min-Cheol 한국군사과학기술학회 2005 한국군사과학기술학회지 Vol.8 No.3
In this paper, the experiments have been conducted to measure the residual velocity for 3.5g steel ball perforating light weight metal plates of aluminum alloy and magnesium alloy. Non-contact electro-magnetic sensors were used to measure the velocity of steel ball before/after perforating plates. The thicknesses of specimens used were about 2.8mm and 4.8mm. The impact velocities of steel ball were from 662m/s to 3594m/s. With same conditions, numerical analysis using Autodyn 2D has been conducted. The results of numerical analysis corresponded with those of experiments. Also, It is suggested that the difference between the residual velocity of experiment or numerical analysis and that of THOR experimental equation of BRL grew smaller as the impact velocity were increased.
송민철,정수빈,강세령,zeenat jabin,유수웅,민정준,범희승,조상건,김자혜,송호천,권성영 대한핵의학회 2018 핵의학 분자영상 Vol.52 No.4
Purpose Thyroglobulin (Tg) may be released from damaged residual thyroid tissues after radioactive iodine (RAI) therapy inpatients with differentiated thyroid carcinoma (DTC). We investigated whether altered levels of serum Tg after recombinanthuman thyrotropin (rhTSH)-aided RAI therapy could be a prognostic marker in patients with DTC. Methods We evaluated 68 patients who underwent RAI therapy after total thyroidectomy. Serum Tg levels were measured justbefore RAI administration (D0Tg) and 7 days after RAI therapy (D7Tg). Patients with a D0Tg level greater than 2.0 ng/mL wereexcluded to more precisely evaluate the injury effect of RAI in small remnant tissues. The ratioTg was defined as the D7Tg leveldivided by that on D0Tg. The therapeutic responses were classified as acceptable or non-acceptable. Finally, we investigatedwhich clinicopathologic parameters were associated with therapeutic response. Results At the follow-up examination, an acceptable response was observed in 50 patients (73.5%). Univariate analysis revealedsignificant differences in N stage (P = 0.003) and ratioTg (acceptable vs. non-acceptable responses, 21.9 ± 33.6 vs. 3.8 ± 6.5; P =0.006). In multivariate analysis, only ratioTg significantly predicted an acceptable response (odds ratio 1.104; 95% confidenceinterval 1.005–1.213; P = 0.040). A ratioTg above 3.5 predicted an acceptable response with a sensitivity of 66.0%, specificity of83.3%, and accuracy of 70.6% (area under the curve = 0.718; P = 0.006). Conclusions Altered levels of serum Tg after RAI therapy, calculated as the ratioTg (D7Tg/D0Tg), significantly predicted anacceptable response in patients with DTC.
송민철,김홍기,김기태,Song, Min-Cheol,Kim, Hong-Gi,Kim, Gi-Tae 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.3
The densification behaviors of copper powder under high temperature processing were investigated. Experimental data were obtained for copper powder under hot isostatic pressing, hot pressing and uniaxial compression. Finite element calculations from the constitutive models by McMeeking and co-workers were compared with the experimental data, The agreements between experimental data and theoretical calculations are reasonably good when hydrostatic stress is dominant, but not as good then deviatoric stress increases.